function open_window(adres){ 
   var przegladarka = navigator.userAgent; 
   var w_idth = 100; 
   var h_eight = 100; 
   var x_poz = 0 
   var y_poz = 0; 
   window.open(adres, 'galeria', 'width=' + w_idth + ',height=' + h_eight + ',resizable=1, scrollbars=0, menubar=0, toolbar=0, location=0, top=' + y_poz + ', left=' + x_poz);
}
function open2_window(adres,w_idth,h_eight){ 
   var przegladarka = navigator.userAgent; 
   var y_poz;
   var x_poz = Math.round((screen.width / 2) - (w_idth / 2)); 
   przegladarka.indexOf('Opera') != -1 ? opera = 1 : opera = 0; 
   opera == 0 ? y_poz = Math.round((screen.height / 2) - (h_eight / 2)) : y_poz = 0; 
   window.open(adres, 'galeria', 'width=' + w_idth + ',height=' + h_eight + ',resizable=1, scrollbars=1, menubar=0, toolbar=1, location=0, top=' + y_poz + ', left=' + x_poz);
}